I have a 4 blade aluminum prop with a 17 pitch. My boat is between the 17 and 15 pitch so I tried them both and I went with the 15. The 17 is a Solas, model 9413-128-17. I think I paid $103 with shipping and tax, $50 and it's yours. Can be picked up in Granby or Parker on various days. Perfect condition, only used a few times. The inner hub kit is not included.